我的代码上有2个多选字段
我想让所有人都选中，然后其他选项将被取消选择并禁用，同样如果选择了其他任何字段，那么所有选项都将取消选择和禁用
我的代码
<select multiple name="country[]" id="device" class="form-control" >
<option value=\'ALL\' selected="selected">ALL</option>
<option value=\'BD\'>Bangladesh</option>
<option value=\'IN\'>India</option>
<option value=\'ID\'>Indonesia</option>
<option value=\'NG\'>Naigeria</option>
<option value=\'PK\'>Pakistan</option>
</select>
和
decimal maxPrice = list.Max(i => i.price);
答案 0 :(得分：0)
编辑：
如何添加额外的按钮来重置菜单？ 请check this fiddle
OLD：
如果您没有按住Ctrl键，则会自动取消选择其他选项
$(document).ready(function() {
$('#device, #country').on('change', function() {
var selectedVal = $(this).val();
for (var i = 0; i < selectedVal.length; i++) {
if (selectedVal[i] === 'ALL') {
// $("#device > option").attr('disabled','disabled');
$(this).find('option').attr('disabled', 'disabled');
$(this).find('option[value=ALL]').removeAttr('disabled');
} else {
$(this).find('option[value=ALL]').attr('disabled', 'disabled');
}
}
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<select multiple name="device[]" id="device" class="form-control">
<option value='ALL'>ALL</option>
<option value='Android'>Android</option>
<option value='iPod'>iPod</option>
<option value='iPad'>iPad</option>
<option value='Java'>Java</option>
<option value='Windows'>Windows</option>
<option value='Linux'>Linux</option>
<option value='Mac'>Mac</option>
</select>
<select multiple name="country[]" id="country" class="form-control">
<option value='ALL'>ALL</option>
<option value='BD'>Bangladesh</option>
<option value='IN'>India</option>
<option value='ID'>Indonesia</option>
<option value='NG'>Naigeria</option>
<option value='PK'>Pakistan</option>
</select>
答案 1 :(得分：0)
$('#device option').click(function(){
var Allselected = $('#device :selected').text();
var AllselectedCountry = $('#country :selected').text();
if(Allselected =="ALL"){
$('#device option:not(:selected)').addClass('ashClass');
}
else if (Allselected !="ALL"){
$('#device option:first-child').css('color', '#ccc');
$('#device option:not(:selected)').removeClass('ashClass');
}
});
$('#country option').click(function(){
var AllselectedCountry = $('#country :selected').text();
if(AllselectedCountry =="ALL"){
$('#country option:not(:selected)').addClass('ashClass');
}
else if (AllselectedCountry !="ALL"){
$('#country option:first-child').css('color', '#ccc');
$('#country option:not(:selected)').removeClass('ashClass');
}
});.ashClass {
color: #ccc;
}
.blackClass {
color: black;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<select multiple name="device[]" id="device" class="form-control" >
<option value=\'ALL\' >ALL</option><option value=\'Android\'>Android</option><option value=\'iPod\'>iPod</option><option value=\'iPad\'>iPad</option><option value=\'Java\'>Java</option><option value=\'Windows\'>Windows</option><option value=\'Linux\'>Linux</option><option value=\'Mac\'>Mac</option> </select>
<select multiple name="country[]" id="country" class="form-control" >
<option value=\'ALL\' >ALL</option><option value=\'BD\'>Bangladesh</option><option value=\'IN\'>India</option><option value=\'ID\'>Indonesia</option><option value=\'NG\'>Naigeria</option><option
value=\'PK\'>Pakistan</option></select>
答案 2 :(得分：0)
通过禁用你说我不会使用这个元素的元素，我拒绝使用这个元素，因此禁用的元素无法获取鼠标事件，因此禁用是错误的方法。
而是将其视觉禁用。
这是纯JS代码，因为我不喜欢jquery;）
<style>
select {
height:300px;
width:150px;
}
</style>
<body>
<select multiple name="device[]" id="device" class="form-control" onChange="Go()" >
<option value=\'ALL\' selected="selected">ALL</option>
<option value=\'Android\'>Android</option>
<option value=\'iPod\'>iPod</option>
<option value=\'iPad\'>iPad</option>
<option value=\'Java\'>Java</option>
<option value=\'Windows\'>Windows</option>
<option value=\'Linux\'>Linux</option>
<option value=\'Mac\'>Mac</option>
</select>
<select multiple name="country[]" id="device" class="form-control" onChange="Go()" >
<option value=\'ALL\' selected="selected">ALL</option>
<option value=\'BD\'>Bangladesh</option>
<option value=\'IN\'>India</option>
<option value=\'ID\'>Indonesia</option>
<option value=\'NG\'>Naigeria</option>
<option value=\'PK\'>Pakistan</option>
</select>
<script>
function Go(){
parentElements = document.getElementsByTagName("select");
for(var i = 0; i < parentElements.length; i++){
parentElement = parentElements[i]
children = parentElement.childNodes;
for(var j = 0; j < children.length; j++){
childNode = children[j];
if(childNode.nodeName == "OPTION" || childNode.nodeName == "option"){
if(childNode.value == "\\'ALL\\'" && childNode.selected == true){
for(var k = 0; k < children.length; k++){
if(typeof(children[k].value) !== "undefined" && k != j){
children[k].style.color = "#ccc";
children[k].style.textDecorationLine = "line-through";
children[k].selected = false;
}
if(typeof(children[k].value) !== "undefined" && k == j){
children[k].style.color = "";
children[k].style.textDecorationLine = "";
}
}
}
if(childNode.value != "\\'ALL\\'" && childNode.selected == true){
for(var k = 0; k < children.length; k++){
if(typeof(children[k].value) !== "undefined" && children[k].value == "\\'ALL\\'"){
children[k].style.color = "#ccc";
children[k].style.textDecorationLine = "line-through";
children[k].selected = false;
}
if(typeof(children[k].value) !== "undefined" && children[k].value != "\\'ALL\\'"){
children[k].style.color = "";
children[k].style.textDecorationLine = "";
}
}
}
}
}
}
}
</script>
</body>